package com.hmdp.utils;


import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {


    private static final long BEGIN_TIMESTAMP = 1640995200L;
    private static final int COUNT_BIT = 32;

    private final StringRedisTemplate stringRedisTemplate;
    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix) {
        // 1、 生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSeconds = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSeconds - BEGIN_TIMESTAMP;
        // 2、生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix  + date);
        //拼接返回
        return timestamp<<COUNT_BIT | count;
    }







}
